An Efficient Hydrometallurgical Process for Extracting Tellurium From Copper Telluride Slag

Copper telluride slag from copper smelting process is an important source of tellurium (Te). In this work, an efficient and economical hydrometallurgical process for extracting Te from copper telluride slag was proposed. First, H 2 SO 4 and NaClO 3 were demonstrated to be effective for separating Te...

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Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2022-10, Vol.53 (5), p.2838-2851
Main Authors: Shen, Yukun, Xu, Shenghang, Feng, Wenyu, Yu, Tanna, Zhang, Huibin, Cao, Huazhen, Zheng, Guoqu
Format: Article
Language:English
Subjects:
Alkaline leaching
Antimony
Bismuth
Characterization and Evaluation of Materials
Chemical precipitation
Chemistry and Materials Science
Copper
Copper telluride
Efficiency
Gold
Hydrogen peroxide
Hydrometallurgy
Intermetallic compounds
Lead
Materials Science
Metallic Materials
Nanotechnology
Original Research Article
Residues
Selenium
Silver
Slag
Sodium sulfide
Sodium sulfite
Structural Materials
Surfaces and Interfaces
Tellurides
Tellurium
Thin Films
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Summary:Copper telluride slag from copper smelting process is an important source of tellurium (Te). In this work, an efficient and economical hydrometallurgical process for extracting Te from copper telluride slag was proposed. First, H 2 SO 4 and NaClO 3 were demonstrated to be effective for separating Te and Cu, and the leaching efficiency of Cu(II) reached 99.44 pct, while that of Te(IV) was only 3.00 pct. Tellurium oxide in the oxidative acid leaching residue was dissolved in NaOH solution, and Na 2 S was added as precipitant to purify alkali leaching solution. Valuable metals (Bi, Se, Pb, Sb, Ag, Au) were enriched in alkaline leaching residue. Furthermore, the separation of Te and Se was realized by adding H 2 O 2 in alkali leaching solution, the precipitation efficiency of Te(VI) was up to 99.43 pct. Finally, Te(VI) was reduced by Na 2 S-Na 2 SO 3 , and the reduction efficiency was 99.85 pct under optimized conditions. The results show that 96.18 pct of Te can be extracted as elemental Te powder with a purity of 99.98 pct, indicating that the process achieves an efficient extraction efficiency of Te from copper telluride slag.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-022-02568-5